23-09-2021, 07:13 PM
Ah. Yes, Mike - though this is indeed at low anode voltages, which I alluded to:
The cathode current is virtually constant as anode voltage is reduced, it's just that electrons don't make it to the anode and they are caught by the screen. Whereas with higher anode voltages, once in the vicinity of the screen, the electrons, rather than being caught by the (rather tenuous and shielded) screen, go on to the anode.
If you reduce anode current by making g1 more negative, while keeping Va above the 'knee' voltage, what happens to Ig2, does it stay the same fraction of Ia then?
(22-09-2021, 03:48 PM)Kalee20 Wrote: The only circumstances where Ia falls and Ig2 rises, is if anode voltage drops to a low level (below the pentode 'knee')...
The cathode current is virtually constant as anode voltage is reduced, it's just that electrons don't make it to the anode and they are caught by the screen. Whereas with higher anode voltages, once in the vicinity of the screen, the electrons, rather than being caught by the (rather tenuous and shielded) screen, go on to the anode.
If you reduce anode current by making g1 more negative, while keeping Va above the 'knee' voltage, what happens to Ig2, does it stay the same fraction of Ia then?
